Hydraulic power device



March 24, 1953 Filed Jan. 17, 1950 IIIIIIIHI i J. J. sLoMl-:R

HYDRAULIC POWER DEVICE 2 SHEETS-SHEET l March 24, 1953 J J SLOMER 2,632,424

HYDRAULIC POWERDEVICE Filed Jan. 17, 195o 2 SHEETS-SHEET 2 Patented Mar. 24, 1953 HYDRAULIC POWER DEVICE Joseph J. Slomer, Chicago, Ill., assigner to Goodman Manufacturing Company, Chicago, Ill., a corporation of Illinois Application January 17, 1950, Serial No. 139,092

1 Claim. l

This invention relates to improvements in hydraulic power devices of the rotary type adapted for drills, although not limited to such use.

Among the objects of my invention is to provide an improved construction, including a detachable motor and valve mechanism on the main casing, to facilitate 'assembly and disassembly of the parts.

A further object is to provide a new and improved power device of the portable type having an improved form of hand-grip and trigger device for controlling the operation or reversal of the motor by the thumb and fingers of one hand.

f A still further object of the invention is to provide an improved form of connection between the motor and the rotary tool-holding member.

Other objects of my invention will appear from time to time as the following specification proceeds and, with reference to the accompanying drawings, wherein:

Figure 1 is a fragmentary longitudinal section of a drilling apparatus constructed in accordance with my invention, taken substantially along the axis of the drill chuck, and showing the fluid control valve vand its operating levers in neutral position;

Figure 2 is a fragmentary section taken substantially along line 2--2 of Figure 1;

Figure 3 is a fragmentary detailed section of the fluid control valve and its operating lever, showing the valve in an open position for rotating the drill motor in one direction;

Figure 4 is a view similar to Figure 3, but showing the valve in position for rotating the drill motor in the opposite direction from that shown in Figure 3;

Figure 5 is a fragmentary end view of the drill, with parts of the motor shown in section generally along the axis of the drill chuck;

Figure 6 is a detailed section taken on line 6-6 of Figure 2; and

Figure 'l 4is a detailed section taken on line 1--1 of Figure 2.

Referring now to details of the embodiment of my invention illustrated in the drawings, a drilling apparatus includes a main casing I0 having a drill chuck II rotatably mounted in a bore l2, opening to the front face of said casing. Said chuck includes a socket member I2a xed on a squared end I3 of a shaft i4 to receive the rear squared end of a drill l5, which may be a wellknown form of spiral drill using a drill bit (not shown) on its forward end. The shaft I4 has a reduced intermediate portion IB journalled iny an antifriction bearing I1 and a splined rear end portion I8 engaged within a hub I9 of an en- 2. larged cup-shaped internal gear 20 journalled in an anti-friction bearing 2l. The internal gear y2li is recessed in 'an enlarged counter-bore 22 opening to the rear face of the main casing I0, as shown in Figure 1.

The main casing I 0 `is provided with two lateral projections 25 and 26 integral therewith and forming connections for opposed handle members 2-'l and 28, respectively. One of the lateral projections 26 is longer than the other and has an elongated recess 29 opening to the rear face of the housing for reception of a control valve block 3Q, which will be hereinafter more fully described.

The handle member 2? connected to the shorter projection 2'5 may be of any suitable form for holding by one hand. As shown herein, said handle member consists of a tubular pipe l32 fixed in a base 33 suitably connected to the projection 215 as by cap screws 3E.

The handle member 2-8 has 'a hand grip 35 at its outer end, herein consisting yof an open rectangular frame formed of a relatively large rear member 36, generally convex in cross-section, for engagement in the palm of the hand, and smaller end and front frame members 3l vand 38, all integral with a hollow base 39. The base 39 has a pair of opposed flanges 4U, d!! detachably connected to the adjacent end of the projection 26 of main casing I0 as by cap screws 4I, VII.

A fluid motor of the gear type, indicated generally at 59, is wholly supported on a rear plate 5I which encloses the recess 22 housing the internal gear 2U. The drill motor 5E! has a drive rotor 52 with its teeth meshing with the teeth of an idler rotor 53. The drive rotor y52 has an integral shaft Ell journalled in the rear plate 5I on suitable roller bearings 55 Aand 56. The rotor shaft 54 has a pinion 5'! fixed 4on its forward end for engagement with the teeth of the internal gear 20. The idler rotor 53 has a shaft '59 journalled in the rearv plate 5I on roller bearings 460 and 6|.

In the preferred form shown herein, the motor f 56 includes a pair of thin bearing plates 65 and 6E in engagement respectively with the front and rear faces of the drive rotor 512 and the idler rotor 53. An intermediate spacer 6l surrounds said rotors, between said bearing plates, and a cover plate 68 is engaged with the outer face of the bearing plate 56. The outer ends of the rotor bearing shafts are journalled in said cover plate. The bearing plates 6.5, 5'6, the spacer 61 and the cover plate 68 are all detachably secured to the graing portion of the rear plate 5I as by cap screws The rear plate l5I includes a laterally elongated portion 1i) formed integrally therewith 'and extending the full length of the lateral projection '26 of the main casing I0 so as to enclose the recess 29 in the latter. The rear plate ISI is detachably secured to the casing as by a plurality of cap screws 1I, l I.

The controllyalvefblock 30 issdeta;chablyconl nected tdtherinner facet-of thereanplate portion 'IB as by a plurality of cap screws 12, l2.

When in assembled position, the control valve;- block is fully enclosed in the recess 29 of casing I0, but is wholly supported on the rear=platespor-- tion 10.

The valve block has a longitudinalabore113.-.

therein, in which is slidably mounted a piston valve member l of the spool type for controllingk the supply of liquid to the m-otor'thro-ugh ducts 't5 and II formed in the rear plate 5I and-come: municating between said motor and valve ports andylthefyalve block. t. The valve ports` `8l) and ist are i orrned by.l drilled passagewaysSedY and Happening respectivelyinto thesidesao annular, grooves, B 3; and 2,lspaced along the ,lon-

gitudin-al bore i3 of the valvepbloclsfnas seenin,v

Figures V-2, 6 Land .17.. The lowermost valve po-rt 8 I f, seen, .iin-Figures l :and 6,l communicates through.,

ductfllin rear plateiil. Ytooneside citherotors 5Z and 53 imrnediately ati-j acentthe point of their meshed. .engagement with ea-chother. The sec,- ondjport .Sii jconnectsthrough th'educt 'IIS .in rear plate., 5 t to.. the oppositeside .oftherotors 52 L Which-theinternal gear 2 is'housed, so. as to permit the bleeding or return to thefsystem of any liquid.;- which may y? escape by leakage fromy the rotors, ,as ,will hereinafter moredfully appear.

Hydraulic. power -is supp-lied to @the .valve bloclg 30 Athrough .an inlet-pipe-B :andan outlet pipee6 connected toinlet and outlet `ports ,Sl and 98, respectively.` Th'erinlet port 9Lopens-into valveY l bore t'I3 -Ioetweenthe annular grooves Stand Btl... Theoutlet por-t opens into the :annular groove 85. The spool -valve 'member 'M contro-ls theiiow -of iluid selectively-in. either directionv through the motor 55.3V or to. bypass the supply of fluid through thevalveblock in thefollowing mann-err* and titer-mediate l-andsgI @sand I tdslfllced therefalong;

The -spoolfis cross-drilled: atixll, Igtoandi through 'thefcentral bore Iat apoint :between-J the endland It and thejadj acentglandlt3, and' isrsimilarlgyross-drilled atfl t3 betweenhthezoppoa site-en dlai-idY -I t2 andadjacent lan-dI 0d.

Figures l and 2 show th-efva'lve spool inneutral;l intermediate .position-whereinffluidfrom 1 the inlet pip/e 495 is.flzvyp assedyfrom inlet -port' El aroundthe land; I im Y whichpis fing registering: position with gro-ove *mi and thence to theoutlet iport v13; In: this position;: the landV I B3 Vis fin'sregist-ering posi-`r tion- Vwitlof:groove .83. Thus, while; the'iiuidis being bypassed: fromginle'tiatofoutlet; the-valver port-s fandv BI are-open 'tox bothA sides of the motorr'.:` tobalance the supplyof fluid theretor f The fluid also :has egressto .the'cen'ter bore HB5 f,

through the-cross-passages I -iand It ,tobal1V ance :fthe f pressures effective .f on: the" motor fand@ valve mechanism.

Thavalyespool'ld `is controlledfthrough'a valve The :spoolalsof has --acent-er bore" IiijV drilled from-one end ianid closed by a block-g IDE;

stem IIU connected to its outer end and projecting through a thimble III suitably xed at the outer end of the valve block 30. A coil spring I t2 surrounds the stem IIO between the outer end of the spool and the end of th-e thimble I I I. Said spring is of such tension as to maintain the spool inwtszineutral orbyipassillg` position-,vas shown in Figures l and 2, and toreturn saidv spooLfto said neutral position unless the spool is positively moved inwardly or outwardly by the manually controlledv trigger means, to be presently described inore'fully. Y

Figurelshowsvalve spool 'I4 moved to the position for-'supplying fluid under pressure to the ducti' "forfrotatingthe roto-r shaft 54 in counterclockwisedirection, as seen in Figure 2. In this position of "the valvespool, land |014 shuts oi direct-.communication between inlet port 91 and outlet port 9'8, and fluid from inlet port 91 passes downWardlyJ along..l the., spool between the two intermediatelands Ilii andIIlLand thence goutwardly through. port .Bil `totheduct 'IB ,leadnglton one .sideiofi the motor EIL.. The; duct, Il .returning the yriiuid. from, the opposite side of ytheJnotQ-r is.,l in communication. through the port ,8 I. ,which is,A then., ,connected to. Ythe fopposite.. side' of ,f the land.,t IM so that the returning fluid will pass alongtheg spool into .groovevand thenceinto Ythe.. outlet port 93..

Figure linshows the valve spool Vmoved., to ,the oppostefdirection, so as .to ,complete circulation. throughy the ducts. 'I1 and TIS in. the .opposite directionend drve-theA drill-. 1notor, in a clockwise direction.. In this position, `the land I @3ds moved.

to olos-efccmmunication betweentheinlet port 91 and the port it lleading fto. the duct 16,- and., land l ellis moved to closevdirect communication, from-` inletpor-tlto outlet 12191213183., Fluid from the inlet port then passes through .thefport tfandf duct -l' l FluidAvv returning through the ffduct; 'I 6 nas-ses throuf .-;l 1 port-E 801'fintoecrossfpassages .I 01, thence through-the-centenbore fI .in the spool,- and. fromfthencefout ofT cross-passages I @8 at` the. 4opposite enfd. of. the spool into grooveA 85 which Y communicates directly with the outlet pO-rtB.; The ductl'fpreviousl-y'mentioned as connect-- ing the port 32-in-th-e valverblockwith borepv and recessf=22 Affor permittinggth@ 'ib1eeding or. vreturn -to thesystern of anyyliquid;whichfmzayescale: by leakage from. the;rotons,` aiso communicates g with drilled p-assageways Iii and-I IE- extending thevfull len-stoof :therotorhafts 54 and 59: resnectvelvisoas :to-fauci -ireecommunicaftonifb tween; opposite ends: v of1--4 saidi rotor shafts andi: balance any pressures which may d-evelopvfa-longf; saidzis'haits;fv Asiwill. 'begseenzfrom Figurefl; the inner end. -of' the drive. rotorashaft :Eris .open .to lthe interior ofth'e Vinternal`gear-2itwi-thin the:Y recess .22so-as tofbe inl continuous communication with the ductrld through bore =9: rI-hen` inne-r end-"of thesidlerrotorshaft 59 isgalso-"in continuous communication with theduc-t 19 through, the sainebore Str Theiduct lcommunicatesthroughport 8,2 fintothe. annular` groove leading directlytto, the outletport 98.) Aswillll be seen fromA Figures ,.l, r2,. and 3,. theZ port 32.is never, v,closed bya theA spool valve v`in. any. operative posi-tion zofthe latter,- so vthat any excess pres- A sure ,developedthroughleakage in the motor-will be zdrainedgoif through duct aipandsreturned to;r the pressuregsupply line,1 Atzthegs-ame time,-; th er interior-,ofy the recess `22.,-:andotherparts adjacen the 1rotors will: zbe constantly supplied .withuflui under@ a: slight pressures, dependfner: uponzlthef.

amount of back pressure eiective from the outlet port 98.

A packing gland of any suitable form is provided in the reduced portion of the bore |2 to prevent escape of uid from the counterbored recess 22 and the front end of the connecting bore |2. In the form shown, said packing gland surrounds the hub |9 of the internal gear 2|).

A seal ring ||8 may surround the shaft I4 outside the anti-friction bearing i1 for retaining lubricant in the latter.

Referring now to the improved form of hand grip and trigger device for controlling the actuation of reversal of the drill by the thumb and fingers of one hand while the device is in use, the outer end of the valve stem ||0 is provided with an eye Within which a terminal ball |2| on a short lever arm |22 is engaged. The lever arm |22 is pivotally mounted on a pivot pin |23 carried on the hollow base 39 vclose to the path of longitudinal movement of the valve stem H0. The lever arm |22 has two trigger arms |24 and |25 connected thereto. The first trigger arm |24 is disposed approximately at a right angle to the lever arm |22, while the second trigger arm |25 is disposed at an angle of ap-LA proximately 180 degrees to the lever arm |22.

The first-named trigger arm |24, herein shown as formed on a slight curve simulating the trigger of a gun, is arranged so that, when the valve spool 14 is in its neutral position, as shown in Figures 1 and 2, the free end of said curved trigger projects slightly into the rectangular opening formed by the handle portions 36, 31 and 38, and along the inner side of the palmengaging portion 36. To move the valve spool to one operative position, the curved trigger |24 is depressed by the forenger ofthe hand which normally grips the palm-engaging portion 36. The lever mechanism will be rocked bodily on its pivot |23 until the curved trigger |24 is moved into the recessed under face |26 of the palmengaging grip part 36, as shown in Figure 3. By maintaining pressure on the trigger |24 by the forelnger, the valve will be retained in position to drive the drill in counter-clockwise direction.

The second trigger arm |25, herein shown as substantially straight, projects rearwardly through a slot |21 in the base 39 in position to be engaged by the thumb of the hand holding the grip member 35. When it is desired to set the valve spool in position to cause rotation of the drill in a clockwise direction, the thumb may be used to depress the trigger arm |25 into the position shown in Figure 4.

As previously described, the valve stem ||9 is normally controlled by the coil spring H2 and the valve is hydraulically balanced to return the valve to its neutral position, so that the valve is normally neutral seeking when pressure on either trigger arm is released. The trigger arms |24 and |25 can also be manipulated to aid in positioning the valve in its neutral position when desired, or necessary due to failure of the spring ||2.

The inlet and outletpipes 96 and 91 connected to the valve block 30 extend through slots |30 and |3| opening to the rear of the hollow lateral projection 26 (see Figures 2, 6 and 7).

Thus, the rear plate 5|, with motor 20 and valve block 30, can be bodily removed'from the casing Il) and operated for testing independently of the casing I0 and the parts mounted thereon, Without disturbing any of the hydraulic connections therebetween or the connections to the supply pipes.

While I have herein shown and described one form in Which my invention may be embodied, it will be understood that the constrution thereof and the arrangement of the various parts may be altered without departing from the spirit and scope thereof. Furthermore, I do not wish to be construed as limiting my invention to the specic embodiment illustrated, excepting as it may be limited in the appended claim.

I claim as my invention:

In a hydraulic power device, a casing including a central tool supporting body portion and handle supporting projections at opposite sides of said central body portion, one ofsaid projections being provided with an elongated recess opening through one side and the end thereof, a fluid motor supporting plate removably secured to one side of said casing and including an extension overlying said recess at said side of the said one projection, a hydraulic motor supported on said plate with fluid supply passages therefor extending along said extension, a valve block having ports communicating with said iiuid supply passages removably secured to said extension and supported in said recess and having an open ended bore therein opening through the open end of said recess, a handle member removably secured to the end of said one projection and being provided with an aperture aligned with said bore, a reciprocable valve for controlling the direction of fluid flow through said supply passages and valve block disposed within said bore and having a stem projecting through the open end of said recess and said aperture, and linger engageable valve operating means supported by said handle and operatively engaged with said stem.

JOSEPH J. SLOMER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 933,326 McCune et al. Sept. '1, 1909 1,653,750 Van Hamersveld Dec. 27, 1927 2,159,232 Shall' May 23, 1939 o 2,233,163 Fosnot Feb. 25, 1941 2,466,972 Slomer Apr. 12, 1949 

